Questions tagged [esp8266]

An IC that offers Wi-Fi networking compatible with b/g/n standards. It also has integrated TCP/IP protocol stack. Extremely popular along IoT community as a low cost and powerful board.

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1answer
3k views

Serving binary file with ESP8266WebServer

I am currently using a Nodemcu ESP8266-12E with the Arduino IDE in order to control my boiler. Everything is working fine, however I haven't figured out yet how to serve binary files, eg. images. (I ...
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1answer
824 views

Which Protocol to use to control WiFi (ESP8266) enabled Led Light

I am developing a Wifi based Led light (Got Inspired from Philips hue, Lifx). I have little knowledge about web server, clients, Web protocols. I will be using ESP8266 as Controller cum WiFi module. ...
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2answers
3k views

ESP 01 - reset settings to default values

I set up communication between Arduino UNO and ESP 01 module. ESP replied to AT commands, but sometimes I got result from ESP uncompleted or with wrong characters, so I tried to set AT+IPR=9600, I ...
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1answer
2k views

ESP8266 Web Server Crash + Arduino IDE

I am working on HTTP GET Request. I have created ESP wifi as web server. It creates a access point with IP address : 192.168.4.1 When my android app is connected to web server, it sends values every ...
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2answers
1k views

Arduino Uno and ESP01: can't issue AT commands [Solved]

I would like to connect an Arduino Uno and an ESP 01 module. I use the Arduino IDE and I tried to test communication via serial monitor. I get the "ready" message from the ESP 01, but I am not able to ...
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1answer
37k views

Sending Arduino data to MySQL using phpMyAdmin and XAMPP using Windows10

I want to send my Arduino's sensor data to a MySQL database, using XAMPP and phpMyAdmin. I have been using an ESP8266 for the wifi connection. But I am unable to send the value. And actually I have to ...
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5answers
46k views

How to read and write EEPROM in ESP8266

I need to know how I can write integer values in EEPROM and retain the value on power on. char *Red = strstr(myTestUrl, "/R"); if (Red) { int RedValue = atoi(Red + 2); analogWrite(12, RedValue); ...
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2answers
1k views

rs485 and serial ISP

I made a couple of arduino mini pro and esp8266 pcbs with an rs485 transceiver just to find out that I forgot to think about in-system-programming: Assuming that I don't need to disable the ...
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1answer
1k views

Unable to communicate between ESP-12E module and mobile through ESP-12E router

I am newbie in Arduino. I'm trying to send data from an ESP-12E client module to a mobile via an ESP router module (I am using Arduino IDE for programming the ESP-12E). For this purpose I ...
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1answer
4k views

How do I reset an ESP8266 with an FTDI and no reset button?

How do I reset an ESP8266 with an FTDI and no reset button? I assume that it has something to do with the reset pin on the ESP8266, but I cannot find a step-by-step usage of the pin online.
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1answer
8k views

Problems returning char array from function, value gets messed up

I use the Base64 library for Arduino (but I don't think the problem is related to the library) and have the following function definition: char* decodeImage(char inputString[], unsigned int ...
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1answer
931 views

Posting to EEPROM via HTML - ESP8266 Arduino IDE

For those of you familiar with my somewhat steep EEPROM learning curve...thank you for continuing to share your knowledge. I see how it's supposed to work and it's falling into place. I've run into ...
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1answer
38 views

WiFi thermometers: save different location string as const across many devices

I've built a very simple WiFi thermometer out of an Adafruit ESP8266 HUZZAH breakout board and a TMP36 temperature sensor. I have it reporting the temperature over wifi to my computer which will be ...
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1answer
880 views

MPU9250 - Calibration Not Saved with RTIMULib EEPROM Issues

I'm using the MPU9250 and the RTIMULib to perform sensor fusion, however, when I run ArduinoMagCal, and save the calibration, and follow that with running the main ArduinoIMU it claims the calibration ...
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3answers
3k views

Average response time of Esp8266 module

I'm planning a project where I'd like to control an RC car with Arduino and an Esp8266 module. A software running on a computer would read the input from an USB analog controller and send the data ...
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1answer
134 views

Determine Object Heading

Is there a sensor I could use which would let me know which direction an object is heading/facing? i.e. I have a servo that can rotate 0 to 180 degrees, and I have another sensor on a block. When I ...
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1answer
337 views

Control many devices via Wifi [closed]

I have one Arduino and I want to control a Servo motor and other devices. The Servo motor is further away from the Arduino so I want to control it wirelessly. The problem is that I want the Servo to ...
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1answer
9k views

ESP8266 to ESP8266 communication using Arduino IDE

I am trying to achieve communication between two ESP8266, ie one acts as a server and the other acts as a client, where i am passing the string from the server's serial monitor to the client. But the ...
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3answers
9k views

Basic Question - ESP8266 Board Pins

I have an embarrassingly simple question. My experience to date has been limited to Arduino Uno + Wifi101. I bought an ESP8266 and noticed that the GPIO pins don't match the printed numbers on the ...
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2answers
2k views

ESP8266 - Error: unknown opcode or format name 'jmp'

I bought a nodeMCU 8266 and I'm hoping that it can replace my bulkier UNO+WiFi 101. I'm getting an error when I compile: Error: unknown opcode or format name 'jmp' I'm using it in void SoftReset() ...
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3answers
14k views

Arduino Uno - ESP 8266: sending AT commands via Code

I bought a ESP 8266 & I am able to send AT commands and receive response via serial monitor when I upload a empty sketch. I changed the baud rate from 115200 to 9600 by using AT+CIOBAUD=9600 and ...
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6answers
26k views

How to connect Wi-Fi shield ESP-12E-ESP8266-UART-WIFI-Wireless-Shield with Arduino

I have bought this shield from ebay and now I don't know how to use it, ESP 12E ESP8266 UART WIFI Wireless Shield for Arduino UNO R3 Bouclier Sans filfr: There are no instructions in the box or ...
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4answers
21k views

Can ESP8266 replace Arduino?

I’m a hobbyist and have used Arduino so far for simple projects. Now I want to build a project involving addressable LEDs, I want to write several programs on the Arduino for the LEDs and on my phone ...
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2answers
2k views

How to compile an official VS1003 / VS1053 example for Arduino / ESP8266?

Have anyone ever successfully run any of the official playback and recording examples for VS1003 or VS1053 on Arduino / ESP8266? I mean, I was able to play sound with VS1003, but I just can't make the ...
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1answer
793 views

ESP2866 and java ServerSocket

So I have an application that runs on the Arduino that passes info over serial. I'm using a ESP2866 to make it wireless. Arduino->Serial->Esp2866->SocketConn->JavaSocket->Console I ...
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1answer
1k views

ESP8266 not able to communicate over serial connection with arduino UNO

This is the code I uploaded in Arduino UNO: #include<SoftwareSerial.h> SoftwareSerial ESP(2,3); // RX, TX //ESP RX-->3(UNO) TX-->2(UNO) void setup() { // Open serial communications and ...
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2answers
23k views

How to determine Flash size?

I need to determine the flash size of my ESP8266 on my NodeMCU module in order to flash the AT firmware onto the board. Apparently different boards come with differently-sized flash memories. Can ...
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1answer
2k views

MQTT and IR code Raw

I want to upload/pubish RAW IR Code to MQTT server received through my ESP8266. I have received the following RAW IR code from the Television using the IR receiver sensor: RAW IR CODE = { 4650,...
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1answer
861 views

How to filter a blank line received over serial - ESP8266

How can I filter a garbage completely blank line over my serial data? It comes from the wifi module ESP8266 How I read data: while (Serial1.available()){ String inData = Serial1....
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0answers
684 views

AI thinker AT firmware [closed]

Can anyone please provide me a link to the Espressif IOT SDK user manual? I need it to flash AT firmware onto my nodeMCU but all the files available on the Espressif website do not contain the list ...
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2answers
7k views

Weird characters in Serial Monitor and not functioning ESP8266 ESP-12e

I did a bit of playing with my new ESP-12e, but suddenly it kind of fails on me. It gives me some weird looks it didn't give me (as much) before. This is what the Serial Monitor prints when I try to ...
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1answer
7k views

ESP8266 Battery Monitor

Is there a way to monitor the battery that feeds an esp8266 in a portable project? I have been meaning to implement that feature into my project so that i can be warned when the battery runs low on ...
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5answers
2k views

No Response to AT commands

I'm unable to communicate with my nodemcu ESP8266 module using the AT commands. The module does not return 'ready' on the serial monitor and entering AT commands has no effect at all. I am able to ...
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0answers
1k views

Arduino Wifi/Wemos Wifi D1 adding &t=0 to simple GET request

I'm attempting to make a simple get request to my website from my arduino, but I'm unable to do so. I keep getting the following error: <html> <head> <meta http-equiv="refresh" ...
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1answer
3k views

Sending binary data to HTTP server

I am new to low level programming.I am trying to send binary data to the http server.At the moment i just fill up the byte array with numbers and send them to the server(eventually i want to send ...
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0answers
2k views

Programming an Arduino over the air using an ESP8266

This question stems from this article (Originally in Spanish/English) which Hack a Day summarizes (Includes link to partial English translation). These articles show that it is possible to update an ...
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1answer
697 views

upload real time ultrasonic sensor data to pubnub using arduino and esp8266

I want to upload the real time data of ultrasonic sensor attached to my Arduino Uno and I have been using esp8266 module for the WiFi connection. I want to upload to PubNub but I don't know how to ...
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2answers
4k views

How to serve multiple connections with an ESP8266 and an Adruino?

I want to make a server using an ESP8266 (12e) and an Arduino Nano. I have got everything hooked and I created a minimal "Hello World" example, based on a number of samples found on the web, which is ...
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1answer
892 views

Opening webpage using ESP8266 in Arduino

I am trying to open the webpage in ESP8266 via Arduino Mega. I have successfully opened the webpage if I use the AT command in the Serial Monitor The output is perfect +IPD,382:HTTP/1.1 200 OK ...
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1answer
532 views

Manual TCP connection using WiFi ESP8266 module mistyped command

The command is working fine if I type it directly to the serial interface AT+CIPSTART="TCP","192.168.1.5",1647 But if I want to make it automatic and send it whenever I want from inside the code is ...
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5answers
58k views

How to change baudrate of ESP8266 (12e) permanently?

IMPORTANT: DO NOT USE AT+IPR=9600! (see update) I have an ESP8266 12E module that communicates at 115,200 bauds. Since I use it with an Arduino Nano with SoftwareSerial things get messy. So I found ...
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2answers
2k views

How did I burn out this ESP8266 unit?

ESP8266 -> FTDI -> USB Mac I followed the wiring on this page: http://williamdurand.fr/2015/03/17/playing-with-a-esp8266-wifi-module/ I was communicating with it via Serial at 115200. I issued a AT+...
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1answer
555 views

ESP8266 - CIPSEND & external power supply Hangs program

Updated: I connected my esp to external power, the blue light stays on, I start getting garbage data. I used voltage regulator which was giving 3.4v, power supply tested with 1A & 2A. Old ...
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2answers
3k views

ESP8266 reset problem

I am trying some AT commands with ESP8266 but it resets continously when it stop resetting, i can't get any response from ESP8266. Example : AT OK AT+CWMODE=1 OK AT+CIPMODE=0 OK AT+CIPMUX=1 OK ...
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2answers
1k views

Arduino nano to esp8266 level shifting needed?

I want to connect an Esp8266 Wifi module to an Arduino nano. I am wondering if I need to implement level-shifting for the Arduino TX line to Esp RX line? I find different schema's on the net. Some ...
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1answer
63 views

ESP8266 does not response

My wire schema ; http://bloglug.com/wp-content/uploads/2015/08/Arduino-esp8266-baglantilari.png And i'm using arduino, it has blank loop. I'm trying AT command by using Serial Monitor and I have no ...
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2answers
7k views

Do I need 3 voltage dividers to control ESP8266

I am buying an ESP8266 and the plan is to control it serially from an Arduino. I am going to use a voltage divider(Using a voltage divider is temporary and I know the cons of using voltage dividers). ...
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0answers
752 views

Error loading Blink sketch in esp01 (esp8266)

I have the esp01 connected the serial port using a usb to ttl serial cable and also using the Arduino UNO as suggested in some tutorials. I can execute AT commands. But loading a sketch from Arduino ...
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2answers
3k views

What is the best way to get more RAM for a sound buffer?

The problem: How to extend the memory for a sound buffer (intensively used) if: SD card library supports only one file open at a time (and I have one open already) EEPROM chips are able to stand ...
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1answer
3k views

ESP8266 Arduino 2.2inch ILI9341 TFT library

I recently got one TFT LCD from aliexpress which supports SPI and uses ILI9341. This is the one.TFT LCD I have the ESP8266 EspressoLite 1 board, and I am using ESP8266 Arduino. (https://github.com/...